Hand 1) he's got a flush 100% and it's likely the nut flush.
Hand 2) he's trying to stack you.
Hand 3) Don't cbet that flop. It's not horrible since you have the A but definitely don't double barrel that turn. You can call the river just to see what the other guy has, I guess. You could try to bluff, i guess. But I would fold.
Hand 4) We expect the aggressor to squeeze?